Propeller.



c. A. SWENSON. a PROPELLER.

AP nnnnnnnnnnnnnnn P117! 1999. I

' Patented July 11,1911:

ENT ornicn.

'Tfll GTTO E. KUEHL, F MEDFURID, MASSACHUSETTS.

rnorrsnnnn.

To all whom it may concern:

Be it known that I, Gnannns A. Swanson, citizen of the United States,residing at Medford, in the county of lifedford and State ofMassachusetts, have invented cer tain new and useful improvements in Propellers, of which the following is a specification.

My invent-ion relates to propeller blades that are used for thepropulsion :of vessels through air, water or other fluid, or for theiinpulsion of air or other fluid, as infans and centrifugal pumps, orfor the generation of power.

The object of my invention is to provide a fluid propeller or likestructure of a more effective form than those zit-present: in use, andparticularly to so construct the propeller blades that the lateral slipof fluid toward the tips of the blades shall'be prevented, so that theair, water or other fluid will be forced directly rearward from thepropeller blade, this novelconstruction further permitting the propellerblades to be pitched rearward or placed at less than a right angle tothe shaft upon which the blades are mounted. '1;.. i

My invention is applieable to'the pi opifi sion of boats, air ships, orfor use with fans,

pumps, or water wheels.

For a full understanding of theinvent on and the merits thereof, and toacqulre a knowledge of the details of construction, ref:

erence is to be had to the following description and accompanyingdrawing, in which: Figure l a face view of my improved propeller; Fig. 2is a perspective view thereof; and, Fig, 3 is a view showing the edge ofone of the blades, the other blade being cut away. I

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawing by the samereference characters. v

Referring to these figures, 2 designates the opposed blades ofatwo-bladed propeller or like structure. These blades in theillustration shown, are formed with shanks 3 which aresemicylindricai-in section and are adapted to be clamped upon apropeller shaft designated by the numeral 4. These (.opposed sections orshanks 3 are clamped aspen the shaft in. anydesired manner, but I .haveshown there as being forined with mar- ,iggtinel flanges 5 through.VlllCll, PBfSS bolts 6.

.peller blades,

Specification of Letters 2mm. Patented-July 11, 1-911. hpplieation filcdSeptember 17, mos. Serial nolsiaas's'.

form pr n eachblade being set at a differ. ent angle to the opposedblade. 1

The blades 2 have the usual The novel feature of my invention consistsin forming each blade with a series. of ribs? which extend transverselyacross the face of the blade, preferably from one edge tothe;

other. While I do not wish to limit myself to this, these blades arepreferably curved approximately concentric to the shaft 4 so as toreduce, as far as possible, friction as they pass through the water orother fiuid.

The curvature of the ribs 7 is only approximately concentric to theshaft 4. Preferably the blades are sections of a spiral, the cen ter ofthe spiral being the shaft 4. Each projection or rib therefore acts as apropeller in itself, by catching the Water and throwing it directlyastern.

As before stated, the ribs 7 are only approximately concentric to theshaft. Preferably, the ribs extend across the face of the blade, fromone edge to the other thdreof, at an angle to the longitudinal axis ofthe blade, so that the rearward or leaving end of each rib will benearer to the tip or extremity of the blade than the I forward orfentering end of the rib. This particular inclination of the rib to theaxis of the blade, combined with the angle which the rib has to the faceof the blade, gives to each rib the effect of a small propeller'initself, and the blade has not only the general action of the screw,, buteach of the ribs thereon has a screw "action which tends to force thewater rearward off the edge of the rib. This is a most important featureof my invention,

and acts to give my propeller a much greater power "than is possiblewith. propellers having smooth acting faces.

\ The screw propeller as now used',rev lves at right; angles to theshaft. A pro ell r or like bladed wheel having the ribs 7 thereon, maybe pitched rearward and be used to better advantage than a propeller inwhich the blades are at right angles to the shaft,

fluid from being thrown toward the tips 'of as the ribs' prevent thewater, air or other the blades by centrifugal motion. It will be obviousthat with a smooth-bladed propeller, the fluid will 'ha'veia tendency toSlip laters ally, and that the whole force of the screw will not bedelivered in lines parallel to the axis of the shaft upon which thepropeller lLlllTlSA This is for the reason that the fluid 'has atendency not only to be projected rearward, but to be forced laterallyor outward toward the tips of the blades. The ribs 7 or otherprojections on the face of my propell er, p1"event this lateral movementof the water so that the propeller has a better grip upon the water orother fluid. There is no slipping of the water laterally or in thedirection of the longer axes of the blades, and all of the force of thepropeller is delivered in line with the shaft.

lVhile I do not wish to be limited to the exact form of the projectionsor ribs 7, I preferably form them as above described, and the ribsshould be as sharp-edged as possible, and as thin as is consistent withstrength, in order to eliminate friction.

Blades constructed .in accordance with my invention are designed fog;use on any device using the screw propeller principle, such asaero-nautical vessels, wind mills, marine propellers, electric fans,blowers,'turbines,

etc, and therefore, it will be obvious thatl do not wish to be limitedto the exact form.

of the propeller shown in the illustration,

nor to the details of construction, the nune ber of blades, etc.

Having thus des'eribed the inrentiongrhat I claim is:

A propeller ot' the hind described. coin prising a shaft and propellerblades thereon, the face of the blades being slightly eoncaved and saidblades being inclined rearward and outward relative of the shaft, eachof said blades having on its face a series of outwardly projecting,curved ribs, said ribs extending outward at an angle to the face of theblade but parallel to the axis of the shaft and said ribs extending atan inclination to the longitudinal axis of the blade, the exit end ofeach rib being nearer to the outer extremity of the blade than theentering end thereof.

In testimony whereof I attix my signature in presence of two witnesses.

CHARLES ALFRED SWENSON.

Witnesses:

OTTO E. KUEnL, ABRAHAM FINE.

